On Wed, Oct 1, 2008 at 7:53 PM, wren ng thornton <[EMAIL PROTECTED]> wrote: > > [1] Just like existential types, you can put something in but you can never > get it back out again. For inescapable monads like IO and ST, this is why > they have the behavior of sucking your whole program into the existential > black-hole.
That's true for IO, but the whole point of ST is that it *is* escapable. What makes ST (and IO and STM) unusual is that it can't be implemented in pure Haskell without special support from the run-time system. -- Dave Menendez <[EMAIL PROTECTED]> <http://www.eyrie.org/~zednenem/> _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
